1. Before check of pistons with rods remove piston rings from pistons and carefully clear pistons.

2. For removal of piston rings from pistons unclench a piston ring and insert under a ring evenly on a circle of 2 or 3 old edges of the probe and on them shift a ring from the piston.

3. Be careful. Do not scratch the piston the ends of a ring. Rings very fragile can also burst if to unclench them very strongly. Working edges of piston rings very sharp therefore handle with them very with care not to be cut.

4. Hold each set of rings together with pistons for repeated installation them on the places.

5. Clear all traces of a deposit from the top part of the piston.

6. Remove a deposit from flutes under piston rings in the piston, using the special tool or an old piston ring.

7. After removal of a raid clear the piston the corresponding solvent and wipe dry.

8. Carefully examine each piston on existence of cracks round a skirt and an opening under a piston finger.

9. Check wear on a piston skirt, an opening in a piston head, and also burned in the top part of the piston.

10. Using a new piston ring and an edge of the probe, check a gap of a piston ring in a piston flute.

11. Traces of dot corrosion on the piston specify that cooling liquid got to the combustion chamber. It is necessary to find the reason of hit of cooling liquid in the combustion chamber and to eliminate it.

12. Measure diameter of the piston at an angle 90 ° to an axis of a piston finger and at distance of 50 mm from top.